I'm having a problem when I sharpen a video, then render it, it causes some sort of weird interference; like blur and horizontal lines. It's only when it's rendered though. If I don't render, it doesn't cause the issue. Also, I can scroll through the sharpen percentage, and only the percentage I render at, will give the effect. Other percentages will not be affected.

Properties: 1920x1080 30fps progressive 30Mbps

I'm encoding to H.264 1920x1080 30fps progressive 30Mbps

The export shouldn't make a difference though, as I can see the interference in the sequence preview.

To actually get rid of the fields, you may want to send your footage into after effects. Then right click on the clip and go to interpret footage-main. There you should make sure in the fields and pulldown section that you have it set to probably upper field first for HD footage. If that doesn't work you could try lower field first. Then see if it removes those lines. You can still sharpen back in PP or do it in AE.

No, the source is progressive. And I can see the lines in the preview. Like I said, if I render manually they will be there. If I don't render manually and let the program perform it on the export, they won't appear.

But the thing is it's only when it's being sharpened. If I render the video and export, even with other filters like brightness/contrast, no lines. If I sharpen and export, no manual render, no lines. But when I apply the sharpen effect, render, then export, the lines show.

Sorry, I never saw you ask if I've used that setting before. Yes, I "Use Previews"

But keep in mind, I see the difference in the sequence preview, so I can't be because the export. This issue is regardless of the export because if I don't render them, they're how they should be, exported or not. If I render them, they become weird. Except for the one where you said try upper field first, that one is good.

So, I'm left with 2 questions;

Should I always have the upper field first when working with HD, or is it just some captured videos that require it?

and why is the video okay when I just export it, but looks bad when I sequence>render work area>export?